Re: [PATCH v5 2/2] crypto: ti: Add driver for DTHE V2 AES Engine (ECB, CBC)

[Vinod Koul <vkoul@kernel.org>]

On 11-06-25, 17:53, Herbert Xu wrote:
> On Tue, Jun 03, 2025 at 06:07:29PM +0530, T Pratham wrote:
> >
> > +	// Need to do a timeout to ensure finalise gets called if DMA callback fails for any reason
> > +	ret = wait_for_completion_timeout(&rctx->aes_compl, msecs_to_jiffies(DTHE_DMA_TIMEOUT_MS));
> 
> This doesn't look safe.  What if the callback is invoked after a
> timeout? That would be a UAF.
> 
> Does the DMA engine provide any timeout mechanism? If not, then
> you could do it with a delayed work struct.  Just make sure that
> you cancel the work struct in the normal path callback.  Vice versa
> you need to terminate the DMA job in the timeout work struct.

Typically no. Most of the hardware may not have capability, so we have
apis to terminate.

-- 
~Vinod